Scienza dei dati ensemble-modeling

5

Sto cercando di capire le differenze chiave tra GBM e XGBOOST. Ho provato a cercarlo su Google, ma non sono riuscito a trovare buone risposte che spiegassero le differenze tra i due algoritmi e perché xgboost abbia quasi sempre prestazioni migliori di GBM. Cosa rende XGBOOST così veloce?

41 machine-learning algorithms xgboost ensemble-modeling gbm

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Quante celle LSTM dovrei usare?

Esistono delle regole empiriche (o regole effettive) relative alla quantità minima, massima e "ragionevole" di celle LSTM che dovrei usare? In particolare mi riferisco a BasicLSTMCell di TensorFlow e num_unitsproprietà. Si prega di supporre che ho un problema di classificazione definito da: t - number of time steps n - …

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Relazione tra convoluzione in matematica e CNN

Ho letto la spiegazione della convoluzione e la capisco fino a un certo punto. Qualcuno può aiutarmi a capire come questa operazione si collega alla convoluzione nelle reti neurali convoluzionali? È una funzione simile a un filtro gche applica peso?

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